<template>
 <div class="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" @keyup.enter ="add"/>
      </div>
</template>

<script>
import {nanoid} from 'nanoid'
  export default {
    name:'Header',
    props:['addTodo'],
    methods: {
        add(event){
            //获取用户输入
            let {value} = event.target;
            //校验数据
            if(!value.trim())return alert('输入不能为空！！请核实')
            //将用户输入的事情名，包装成一个todo对象
            const todoObj = {id:nanoid(),title:value,done:false}
            //将上一步的对象push进todos
            const result = this.addTodo(todoObj)
            //清空用户输入
            if(result) event.target.value = ''
        }
    }
  }
</script>

<style scoped>
  /*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}

</style>